If your camera was working up until now and then suddenly stopped, it suggests that something has updated in Windows that affected the camera.

I would usually recommend downloading the camera drivers from the support website of your computer's manufacturer, in case the manufacturer has tweaked the configuration to work with their own machine specifically. If the camera was working and then stopped though, I would suspect Windows as the cause rather than the RealSense drivers.

Can you tell me the version of Windows on your machine please? It should be the second line down, 'Version', on the System Information window. Thanks!

Intel and Microsoft worked together for months to try to solve problems with the SR300 and Build 15063, and builds before and after that. Although some workarounds were tried, ultimately more often than not, a solution could not be found. This led eventually to the issuing by Intel of the notice below.

If your needs are urgent, a radical solution may be to do a 'recovery boot', if your laptop manufacturer supports this feature. Dell and Lenovo definitely do. This is where it wipes your whole computer and reinstalls Windows but also installs all the applications, settings and driver files that came with your PC, returning it to a state it resembled when first bought.

A problem with this approach is that even if the camera is restored, it may be disabled again as soon as Windows performs an update. So after a successful recovery boot, you would have to change your Windows options so it requires your permission to install each new update instead of doing it automatically.